An interracial family in Oregon filed a report with police after they discovered a swastika painted on their minivan, police told ABC News.

The Stewart family of Milwaukie, Ore., discovered the swastika at around noon on June 18 and filed the report the same day, the Clackamas County Sheriff's Office in Oregon told ABC News. There was no evidence or surveillance of the act, police said.

The swastika was drawn backwards, according to a report from KATU. But Nicole Stewart, a member of the family, told KATU that detail was irrelevant. She said she thought it was still intended to show hatred for her family.

KATU/ABC News

"I knew it was targeted to our family because we're the only mixed family, African-American family in the neighborhood," she told KATU.

She added that she was friends with the majority of her neighbors and could not imagine them committing such an act of hatred.

The police were hesitant to classify the graffiti as a hate crime until they received more information, and were seeking tips from the public.

"We haven't ever taken reports dealing with swastikas or hate crimes, so we don't know if it was a hate crime or a stupid teenager," Robert Wurps, a spokesman for the Clackamas County Sheriff's Office, told ABCNews.com.

Wurps said the discovery was "shocking."

"It's disturbing to the public," he said. "We see graffiti, but we don't see swastikas a whole bunch."

KATU also reported in May that the White Genocide Project had peppered a neighborhood in Milwaukie with fliers advertising white supremacist literature.

As of Thursday afternoon, the sheriff's office had not received any tips from the public.